In the microwave wireless energy transmission(MWPT), in mostly, the received microwave energy was transformed into direct circuit(DC) energy by adopting distributed rectification. The maximal incident power on the receiver array antenna units determines the rectifier circuit design. However, the power received by the cell at the edge of the array antenna array is smaller than others, which resulting in a change to the impedance of Rectifier circuit, mismatchingwith array antenna cells also cause a larger reflection. In this paper, theoretically, The reflection of the receiving antenna array edge unit is greater than that of the intermediate unit, caused by the changes of the input power on the receiving antenna units and the mismatch between the planar antenna array and the rectifier circuits are presented. Then a lowprofile (0.05λ2), high directivity (12.5 dBi), high front and rear ratio (27 dB) QuasiYagi antenna were designed as probes. The reflection power distribution and the incident power distribution of the 10×10 planar array antenna is measured, moreover the reflection factor (the reflection factor is defined as the ratio of the reflected power to the incident power reached in the surface of the reception antenna unit) is calculated. The experimental results is consistent with the theoretical analysis, which plays a guiding role in improving the efficiency of receiver in MWPT.